import java.util.*;
public class Example3_9 {
  public static void main (String args[ ]){
    Scanner reader=new Scanner (System.in);
    double sum=0;
    int m=0;
    while (reader.hasNextDouble()){
      double x=reader.nextDouble();
      m=m+1;
      sum=sum+x;
    }
    System.out.printf("%d个数的和为%f\n",m,sum);
    System.out.printf("%d个数的平均值为%f\n",m,sum/m);
  }
}
